agora inbox for pgsql-hackers@postgresql.org
help / color / mirror / Atom feedFrom: Nathan Bossart <nathan@postgresql.org>
Subject: [PATCH v4 1/2] Add percentage of transaction IDs that are available to wraparound warnings.
Date: Fri, 14 Nov 2025 09:59:15 -0600
---
doc/src/sgml/maintenance.sgml | 1 +
src/backend/access/transam/multixact.c | 8 ++++++++
src/backend/access/transam/varsup.c | 8 ++++++++
3 files changed, 17 insertions(+)
diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index 7c958b06273..f146e14d3d6 100644
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -674,6 +674,7 @@ SELECT datname, age(datfrozenxid) FROM pg_database;
<programlisting>
WARNING: database "mydb" must be vacuumed within 39985967 transactions
+DETAIL: Approximately 1.86% of transaction IDs are available for use.
HINT: To avoid XID assignment failures, execute a database-wide VACUUM in that database.
</programlisting>
diff --git a/src/backend/access/transam/multixact.c b/src/backend/access/transam/multixact.c
index 8a5c9818ed6..9f5f8e692b8 100644
--- a/src/backend/access/transam/multixact.c
+++ b/src/backend/access/transam/multixact.c
@@ -1053,6 +1053,8 @@ GetNewMultiXactId(int nmembers, MultiXactOffset *offset)
multiWrapLimit - result,
oldest_datname,
multiWrapLimit - result),
+ errdetail("Approximately %.2f%% of MultiXactIds are available for use.",
+ (double) (multiWrapLimit - result) / (MaxMultiXactId / 2) * 100),
errhint("Execute a database-wide VACUUM in that database.\n"
"You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
else
@@ -1062,6 +1064,8 @@ GetNewMultiXactId(int nmembers, MultiXactOffset *offset)
multiWrapLimit - result,
oldest_datoid,
multiWrapLimit - result),
+ errdetail("Approximately %.2f%% of MultiXactIds are available for use.",
+ (double) (multiWrapLimit - result) / (MaxMultiXactId / 2) * 100),
errhint("Execute a database-wide VACUUM in that database.\n"
"You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
}
@@ -2186,6 +2190,8 @@ SetMultiXactIdLimit(MultiXactId oldest_datminmxid, Oid oldest_datoid)
multiWrapLimit - curMulti,
oldest_datname,
multiWrapLimit - curMulti),
+ errdetail("Approximately %.2f%% of MultiXactIds are available for use.",
+ (double) (multiWrapLimit - curMulti) / (MaxMultiXactId / 2) * 100),
errhint("To avoid MultiXactId assignment failures, execute a database-wide VACUUM in that database.\n"
"You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
else
@@ -2195,6 +2201,8 @@ SetMultiXactIdLimit(MultiXactId oldest_datminmxid, Oid oldest_datoid)
multiWrapLimit - curMulti,
oldest_datoid,
multiWrapLimit - curMulti),
+ errdetail("Approximately %.2f%% of MultiXactIds are available for use.",
+ (double) (multiWrapLimit - curMulti) / (MaxMultiXactId / 2) * 100),
errhint("To avoid MultiXactId assignment failures, execute a database-wide VACUUM in that database.\n"
"You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
}
diff --git a/src/backend/access/transam/varsup.c b/src/backend/access/transam/varsup.c
index 3e95d4cfd16..2921148ceba 100644
--- a/src/backend/access/transam/varsup.c
+++ b/src/backend/access/transam/varsup.c
@@ -175,6 +175,8 @@ GetNewTransactionId(bool isSubXact)
(errmsg("database \"%s\" must be vacuumed within %u transactions",
oldest_datname,
xidWrapLimit - xid),
+ errdetail("Approximately %.2f%% of transaction IDs are available for use.",
+ (double) (xidWrapLimit - xid) / (MaxTransactionId / 2) * 100),
errhint("To avoid transaction ID assignment failures, execute a database-wide VACUUM in that database.\n"
"You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
else
@@ -182,6 +184,8 @@ GetNewTransactionId(bool isSubXact)
(errmsg("database with OID %u must be vacuumed within %u transactions",
oldest_datoid,
xidWrapLimit - xid),
+ errdetail("Approximately %.2f%% of transaction IDs are available for use.",
+ (double) (xidWrapLimit - xid) / (MaxTransactionId / 2) * 100),
errhint("To avoid XID assignment failures, execute a database-wide VACUUM in that database.\n"
"You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
}
@@ -490,6 +494,8 @@ SetTransactionIdLimit(TransactionId oldest_datfrozenxid, Oid oldest_datoid)
(errmsg("database \"%s\" must be vacuumed within %u transactions",
oldest_datname,
xidWrapLimit - curXid),
+ errdetail("Approximately %.2f%% of transaction IDs are available for use.",
+ (double) (xidWrapLimit - curXid) / (MaxTransactionId / 2) * 100),
errhint("To avoid XID assignment failures, execute a database-wide VACUUM in that database.\n"
"You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
else
@@ -497,6 +503,8 @@ SetTransactionIdLimit(TransactionId oldest_datfrozenxid, Oid oldest_datoid)
(errmsg("database with OID %u must be vacuumed within %u transactions",
oldest_datoid,
xidWrapLimit - curXid),
+ errdetail("Approximately %.2f%% of transaction IDs are available for use.",
+ (double) (xidWrapLimit - curXid) / (MaxTransactionId / 2) * 100),
errhint("To avoid XID assignment failures, execute a database-wide VACUUM in that database.\n"
"You might also need to commit or roll back old prepared transactions, or drop stale replication slots.")));
}
--
2.50.1 (Apple Git-155)
--qmnHGfI3v6dYD6Bi
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment;
filename=v4-0002-Bump-transaction-ID-limit-to-warn-at-100M.patch
view thread (700+ messages) latest in thread
Message-ID: <no-message-id-1203165@localhost>
Permalink: ../../no-message-id-1203165@localhost/
Also on: postgresql.org/message-id/no-message-id-1203165@localhost
reply
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-hackers@postgresql.org
Cc: nathan@postgresql.org
Subject: Re: [PATCH v4 1/2] Add percentage of transaction IDs that are available to wraparound warnings.
In-Reply-To: <no-message-id-1203165@localhost>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by agora; see mirroring instructions
for how to clone and mirror all data and code used for this inbox